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Expression analysis of strains Streptococcus pneumoniae KCTC 5080T, Streptococcus mitis KCTC 3556T, Streptococcus oralis KCTC 13048T, and Streptococcus pseudopneumoniae CCUG 49455T

ABSTRACT: Expression analysis of strains Streptococcus pneumoniae KCTC 5080T, Streptococcus mitis KCTC 3556T, Streptococcus oralis KCTC 13048T, and Streptococcus pseudopneumoniae CCUG 49455T

PROVIDER: PRJNA162399 | ENA |

REPOSITORIES: ENA

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Expression analysis of strains Streptococcus pneumoniae KCTC 5080T, Streptococcus mitis KCTC 3556T, Streptococcus oralis KCTC 13048T, and Streptococcus pseudopneumoniae CCUG 49455T

Project description:Investigation of whole genome gene expression level changes in S. pneumoniae KCTC 5080T, S. mitis KCTC 3556T, S. oralis KCTC 13048T, and S. pseudopneumoniae CCUG 49455T. This proves that transcriptional profiling can facilitate in elucidating the genetic distance between closely related strains. A one chip study using total RNA recovered from S. pseudopneumoniae CCUG 49455T with three strain. For the the transcriptome of S. pseudopneumoniae CCUG 49455T was analyzed using the S. pneumoniae R6 microarray platform and compared with those of S. pneumoniae KCTC 5080T, S. mitis KCTC 3556T, and S. oralis KCTC 13048T strains.

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Expression analysis of strains Streptococcus pneumoniae KCTC 5080T, Streptococcus mitis KCTC 3556T, Streptococcus oralis KCTC 13048T, and Streptococcus pseudopneumoniae CCUG 49455T

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Project description:Our group recently transcriptomically characterized coculture growth between Streptococcus mutans and several species of commensal streptococci (Rose et al, 2023; Choi et al 2024). One interaction that stood out was with Streptococcus mitis ATCC 49456, which completely inhibited the growth of S. mutans during biofilm formation. This is due to abudant hydrogen peroxide production by S. mitis ATCC 49456, 3-5x higher than other oral commensal streptococci we have worked with. To understand how the transcriptome of S. mutans is modified in coculture with a high hydrogen peroxide producer, we evaluated the transcriptome during monoculture or coculture growth between the two strains. Our results show differential gene expression (DEGs) in S. mutans that follows other trends we have documented previously with other commensal Streptococcus species, as well as DEGs specific to the interaction with S. mitis.

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Effects of Streptococcus oralis biofilm on peri-implant soft-tissue cells

Project description:Human gingival epithelial cells (HGEp) and fibroblasts (HGF) are the main cell types of the peri-implant soft-tissue, with HGEp constantly being exposed to bacteria and HGF residing protected in the connective tissue as long as an intact mucosa-implant seal is preserved. Streptococcus oralis belongs to the commensal bacteria, is highly abundant at healthy implant sites, and might exert host modulatory effects on soft-tissue cells as described for other streptococci. Thus, we aimed to investigate the effects of S. oralis biofilm on HGEp as well as HGF. HGEp or HGF were grown on titanium separately and responded to S. oralis biofilm challenge. The cell condition of HGF was dramatically impaired after 4 hours showing a transcriptional inflammatory and stress response. In contrast, S. oralis challenge induced only transcriptional inflammatory response in HGEp with their cell condition remaining unaffected. Subsequently, HGF were susceptible compared to HGEp. The proinflammatory IL-6 was attenuated in HGF and CXCL8 in HGEp indicating a general tissue-protective role of S. oralis, forasmuch as the HGF are not exposed. In conclusion, an intact implant-mucosa interface is a prerequisite so that commensal biofilms can promote homeostasis for tissue protection.

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